Re: event TRC_MEM_PAGE_GRANT_TRANSFER

[Rob Gardner <rob.gardner@hp.com>]

Cesar Fernandes wrote:
> Greetings,
> 
> I'm using xen 3.0.4_1. I need to log  the event 
> TRC_MEM_PAGE_GRANT_TRANSFER, which, I believe, is the number of page 
> exchanges between domU and dom0. It seems that this event is not being 
> logged in xen buffer, therefore, xenmon/xentrace is not working either.


Yeah I noticed that I/O count has not been working lately in xenmon but 
haven't had a chance yet to see why. The TRC_MEM_PAGE_GRANT_TRANSFER 
event is being "logged" but the reason it doesn't show up in the trace 
buffer may be because that event is never actually happening. It seems 
that there has been some change in the mechanism used to move I/O pages 
between domains.

So some research needs to be done to figure out exactly what code should 
be instrumented with some trace call in order to provide xenmon with 
data on the number of I/O's or I/O pages. If anyone can help, it would 
be appreciated.

Rob Gardner